body {
  padding: 0px 100px;
  margin: 0;
}

nav {
  display: table;
  width: 100%;
  position: sticky;
  top: 0;
}

nav h3 {
  display: table-cell;
  outline: 1px solid #fff;
  background-color: #4caf50;
  color: #fff;
  text-align: center;
  padding: 10px;
}

p {
  font-size: 16px;
}

